looking for a man believed to be the fifth victim. ken makovec shows us it is a painstaking process. >> reporter: it is day four of the search through the keller canyon landfill here in pittsburgh. authorities are searching for any sign of the whereabouts of 35-year-old frederick sales. they process they are using is first going through with an excavator to loosen up some of the compacted trash and then two dozen volunteers go through that trash by hand. here is a picture of the man they are looking for, frederick sales who father was found beaten to death. they believe it was volunteer demar oh who killed him. he has been charged with the killing of three other people including his ex-girlfriend and two women in their 60s, one of whom he lived with on and off. he was shot and killed by officers last week. they are searching this dump because a car val die more oh often drove was found near some dumpsters and their contents were dumped at this landfill. again, this was day four of the search, authorities believed they will have one or two more days worth of garbage to sift through.